Details on this package are located in Section 10.12.2, “Contents of ISL.”
ISL is a library for manipulating sets and relations of integer points bounded by linear constraints.
Prepare ISL for compilation:
./configure --prefix=/tools \
    --build=${CLFS_HOST} --host=${CLFS_TARGET} \
    --with-gmp-prefix=/tools
        Compile the package:
make
Install the package:
make install
Details on this package are located in Section 10.12.2, “Contents of ISL.”